//main.cpp 
#include "Context.h" 
#include "State.h"
#include <iostream> 
using namespace std;

int main(int argc,char* argv[]) 
{ 
	State* st = new ConcreteStateA();
	Context* con = new Context(st);
	con->OperationChangState();
	con->OperationChangState();
	con->OperationChangState();
	if (con != NULL) 
		delete con;
	if (st != NULL) 
		st = NULL;
	return 0; 
}